<template>
  <div>
    <table border="1" width="700" style="border-collapse: collapse">
      <caption>
        购物车
      </caption>
      <thead>
        <tr>
          <th><input type="checkbox" v-model="setAll" /> <span>全选</span></th>
          <th>名称</th>
          <th>价格</th>
          <th>数量</th>
          <th>总价</th>
          <th>操作</th>
        </tr>
      </thead>
      <tbody>
        <tr v-for="(item, index) in goodList" :key="index">
          <td>
            <input type="checkbox" v-model="item.checked" />
          </td>
          <td>{{ item.name }}</td>
          <td>{{ item.price }}</td>
          <td>
            <button @click="item.num--" :disabled="item.num < 1">-</button
            >{{ item.num }}<button @click="item.num++">+</button>
          </td>
          <td>{{ item.price * item.num }}</td>
          <td><button @click="deleteItem(index)">删除</button></td>
        </tr>
      </tbody>
      <tfoot>
        <tr>
          <td>合计:</td>
          <td colspan="5">{{ allPrice }}</td>
        </tr>
      </tfoot>
    </table>
  </div>
</template>

<script>
import { mapState } from 'vuex'
import { mapGetters } from 'vuex'
import { mapMutations } from 'vuex'
export default {
  data() {
    return {}
  },
  computed: {
    ...mapState(['goodList']),
    ...mapGetters(['setAll']),

    setAll: {
      set(val) {
        this.goodList.forEach((item) => {
          item.checked = val
        })
      },
      get() {
        return this.goodList.every((item) => {
          return item.checked === true
        })
      },
    },
    allPrice() {
      let num = 0
      this.goodList.forEach(
        (item) => item.checked && (num += item.price * item.num)
      )
      return num
    },
  },
  methods: {
    ...mapMutations(['delete']),
    deleteItem(index) {
      this.delete(index)
    },
  },
}
</script>

<style></style>
